Yes I was considering a PE seat compared to a complete (3 seat) skycouch row. If you are comparing single seat to single seat then I can't see any way that a spaceseat would be better than PE!

For the typical flights I do (AKL-SFO) a complete skycouch is typically + $1300-$1500 on top of economy fare. This is often in PE territory and nowhere near Business Premier. For example, a random date next month:

Skycouch paid $2,198
PE $2,182
Business Premier $4,782

However I'm not an expert and can believe that prices approch BP sometimes.